Draftsman&#39;s tool.



L. l. HEATHCOTE.

DRAFTSMANS TOOL.

Arme/umn m50 00119. 1914.

1,155,059. PatentedSept. 28, 15H5.

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f other. Repeat-'the operation in another poexample, lbe

lay the tool on thel line to be divided with the center of the circle. I'

pa'rts.

of. say is to be theftool maybe operated in several ways to used in making vany one 'other'hand it is desired to divide a line into edge',

sition. on they cireleandwhere the two diametric lines throughthe'circlecross will be Another example of'l he utility ofthe 4tool will be, given in' aicasewhere it is desired to divide a 'lineLof either an o dd oran even number of'units into any number of equal '-As, a mere example, suppose aline, `b'etvreenthree and four inches long, divided into five equal parts. While eflectfthe .result here referred to, the l.sim-

plestmethod is to lay the tool on the line to with the 'top edgel of bar 5, in

De,l divided register with; one end of the line 'and at the time make the top edge of bar b, reg

-pointswhere the top edgev of 4each bar i divided, that such instead of using'the *10P eigesr edges-can beused with the same result but all top edges or all lower edges should be a number of--parts greater than -the number of bars' onthe tool, Vfor example, say twenty fpa'rts, theltool mayI be so manipulated as to' eflectthe'result. In' such a case the scale le, onjba'r f,=will`be used by first noting on the scale the Afirst and last line of twenty consecutive lineal1 1f the first line selected for t e 40 appears, lthe twentieth line will be that on which the numeral appears.' Then the sca-leline 40,. in register with Aone end of the linefto be divided, and place a straightlike. theA dat side of Yanother angle, along the underv edge of lowermost bar b, so the tool may be moved in a line that will cause'the scale lines la, to cross the line to be divided.' This angle ofthe scale edge g, withrespect to the 'line to be divided, can be readilydetermined in several back and forward movements of Ithe tool on the scale line 60 'at-'the other end of the line to be divided, the setting offthe tool will be correct to lay off the twenty parts. By then- 4 moving the tool on-the straight edge until line 41, of the -scale intersects the line-to be divided, the first of the twenty parts will be determined, and a. dot or'pin peint will be madeat, that intersection.' j The tool will then be moved intermittently to bring scale lines 42, 43, 44 and so on consecutively, across the line to -be divided', a dot or mark beingv made at each intersectiori and when scale division. If, on the 7 line on which the numeral,

line iO-crosses the end of the line it will be found thatthe latter will have been dividerl into twenty parts, v l

vAs one otherv example let it be presumed that it is desired to divide a line one inch long into a number of parts, say for example, 'twelve parts. The tool will be laid on the one-inch line that is to be divided with the. line lm, on the tool-leading from numeral l2, on bar b, extending in adirection paralllel with said inch line. In doing this the scale 'bar f, will assume a position at an anglewith respect tothe inch line that is to be divided. 'Place a straight edge, such asa rule or an angle, close against Lthegunder side of bar o, of the tool while holding the vlatter in the adjusted position. Then slide the scale it will be found that said inch liney will have been divided into twelve parts.

` It will thus be seen that the scale I5, may' be utilized to edect the functions of numerous scales because by it lines varying 'mate- 'rially in length may be readily divided into many dierent numbers of equal parts.

- The edge g, along bar f, and the edges of bar c, adjacent to the graduated lines are beveled and brought to substantially a knifeedge to facilitate thea-making of dots on the paper at said lines with a pencil or other too Itis obvious that the present invention may be Autilized in connection with any measurement scale other titan inches and the invention is to be construed with this -unlderstanding.

Having thus I claim is,-

l. A draftsmans tool comprising a plate having two right angle bars and an vinclined bar connecting said two right' angle bars whereby to form a triangle and said plate also having a series of bars and` slots of uniform width.' E"

2. A draftsmans tool comprising aplate having two sides at right angles and an inclined side connecting the ends of the two right angle sides one ofV said right angle sides being provided with a scale,-said plate also having a series of lines extending across it in an inclined direction V:Erdrrn the outer edge of one of the right angle sides and converging at a point adjacent 'to the angle formed by the joind'er of the inclined side and one right angle side. h f

3. A draftsmans tool comprising a; plate having a series of bars and slotsand two v edges at right angles to each other said'fplate described miy invention what wenn@ also having :i line cross it from 'the' upper edgeofthe lowermost berend et Aone corner of theulowermost slot'. t

' 1 -A. diaftsmens tool comprieing a trinngularshped plate having two right angle edges anden inclined edge..and.a,1so having zi'slot along one ofjsaid right :ingle edges Ato foi-'m two parallel bars 'and the hat at the" innerside of said: slot havingzt' Scale along .the slotv edge.

Adreftsmns tool eomprieinggi'ilte having two right kangle edges'- anni afslot prallel with one o seid Vedges tn forni parallel here, the llmrfat the inner side et the slot having a, seele and said plete nlefil'iiv ing :i seiesof parallel/ bers and SlotS that extend at .right angles with respeetito the scale bar., i

6. A dm-'tsin-afs tooly comprieingaplfite having tivo `igl'it angle bars and a' slot there;

in that'extends parallel with one of said bars tofonin anotherbarj, saitlfittenbarjl having. a scale thereon, and a bar extending in an inclined direction and connecting the ends of 'theright angle bars and seid in clinedba'r' h'aving perforatimis'l therein.

' A7. A drafts'mans tool .Comprising a trin-v 'angular *plate having' a eseries of 4 sepaizitedf perforations alongone edge ezich with an identifying ehnraeter thereto said triangular plate also. having a. single'` point ,-locate'd thereon"tovr eo'aetwth the locations' of` Seid peiforationsto divideja,"'circle into parts ofunifoim 'size 'and fthe.' plate also 'having-, straight edgefin alinemlent -with -seid single` 

